A:AnswerNo. You can however set repeat notifications-on both your s10 and s20. This makes the phone repeat vibrations or notification sounds every time interval set.
A:AnswerI bought mine in store and it did not change my plan. I have Verizon. It just changed the amount my bill is due to adding the phone payment. I have been upgrading my phone at Best Buy for years and only one time did my plan change. But I like to do it in person in case there is an issue.